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Regulation of photophysical and electronic properties of I-III-VI quantum dots for light-emitting diodes

Science China Materials 2024年第9期67卷 2737-2748页

作者： Xiaofei Dong xianggao li Shougen Yin Zheng li Longwu li Jingling li School of Science Langfang Normal UniversityLangfang 065000China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China Institute of Material Physics Key Laboratory for Optoelectronic Materials and Devices of TianjinKey Laboratory of Display Materials and Photoelectric Devices of Ministry of EducationTianjin University of TechnologyTianjin 300384China College of Chemistry and Materials Science Langfang Normal UniversityLangfang 065000China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China

Quantum dot light-emitting diodes(QLEDs)have become an important research direction in the pursuit of next-generation display technology owing to their favorable attributes,including high energy efficiency,wide color gamut,and low *** in the luminous efficiency and operating life of QLEDs have been achieved by enhancing the photoluminescence efficiency of the quantum dots(QDs)and optimizing the device ***,the current mainstream QDs contain heavy metal elements such as lead and cadmium,which restrict the development and application of QD *** new types of environmentally friendly QDs is crucial.I-III-VI semiconductor QDs have been developed as luminescent materials for constructing high color rendering index QLEDs,owing to the outstanding photophysical properties of these QDs,such as composition-dependent tunable bandgap,large Stokes shift,and highefficiency ***,the microstructures of heterojunctions,especially the surface states and interface states,affect the recombination and transport of carriers in electroluminescent(EL)devices with multilayer thin film structures,which in turn influence the luminous efficiency and stability of the *** review focuses on the synthesis strategies of I-III-VI multi-component QDs and provides an in-depth understanding of the luminescence mechanism and the regulation of photophysical and electronic ***,the application of I-III-VI QDs in multi-color and white EL QLEDs is discussed and the challenges and outlook are addressed.

关键词： Ⅰ-Ⅲ-Ⅵquantum dots synthesis method defect states luminescence mechanism light-emitting diodes

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Synthesis and Photoconductivity of Nanosized Phthalocyanine

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Journal of Materials Science & Technology 2006年第4期22卷 533-535页

作者： Shuguang BIAN xianggao li Lei SHAO Jianfeng CHEN Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China College of Chemical Engineering Tianjin University Tianjin 300072 China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology. Beijing 100029. China

Functional phthalocyanine （Pc） compounds of H2Pc, TiOPc, FePc and CIAIPc were synthesized with a yield of 46.7%, 91.2%, 37.4% and 34.0%, respectively. Nanosized TiOPc was synthesized via a one-step sol-gel method and effects of surfactant doses, nucleation temperature on TiOPc particle size and photoconductivity were investigated. When re（PEG）： m（TiOPc） was 0.1 and nucleation temperature was 0℃, the as-obtained TiOPc had the smallest particle size and largest specific surface area, which were 60 nm and 83m^2/g, respectively. TiOPc synthesized under these conditions also exhibits excellent photoconductivity with charging potential V0, dark decay speed Rd and energy for half-discharging of potential E1/2 being 1160 V, 30 V/s and 0.6 1x.s, respectively.

关键词： Phthalocyanine Nanosize Synthesis Photoconductivity

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Mixed Cations Enabled Combined Bulk and Interfacial Passivation for Efficient and Stable Perovskite Solar Cells

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Nano-Micro Letters 2023年第8期15卷 116-127页

作者： Pengfei Wu Shirong Wang Jin Hyuck Heo Hongli liu Xihan Chen xianggao li Fei Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072People’s Republic of China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072People’s Republic of China Department of Chemical and Biological Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 17104Republic of Korea SUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055People’s Republic of China

Here,we report a mixed GAI and MAI(MGM)treatment method by forming a 2D alternating-cation-interlayer(ACI)phase(n=2)perovskite layer on the 3D perovskite,modulating the bulk and interfacial defects in the perovskite films simultaneously,leading to the suppressed nonradiative recombination,longer lifetime,higher mobility,and reduced trap ***,the devices’performance is enhanced to 24.5%and 18.7%for 0.12 and 64 cm^(2),*** addition,the MGM treatment can be applied to a wide range of perovskite compositions,including MA-,FA-,MAFA-,and CsFAMA-based lead halide perovskites,making it a general method for preparing efficient perovskite solar *** encapsulation,the treated devices show improved stabilities.

关键词： Alternating-cation-interlayer Bulk defects Interfacial passivation Perovskite solar cells

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Synthesis and photoconductivities of bisazo charge generation materials

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 330-334页

作者： Qian ZHAO Shirong WANG xianggao li lili HE Department of Fine Chemical Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Six bisazo compounds were synthesized by coupling 2-(49-aminophenyl)-6-aminobenzoxazole as diazo component with N-phenyl-N9-(2-hydroxy-3-naphthoyl)urea derivatives,and characterized by ultraviolet and visible spectroscopy(UV-Vis),Fourier transform infrared spectroscopy(FT-IR)and elemental analysis(EA).Using these bisazo compounds as charge generation materials and CT-191(2-methyl-4-(N,N-dibenzyl)aminobenzoaldehyde-1,1-diphenylhydrazone)as charge transportation material,organic photoconductive devices were *** result from photoconductivity measurement of the devices shows that the bisazo compound from N-(2-methylphenyl)-N9-(2-hydroxy-3-naphthoyl)urea has the best xerographic performance,V_(0)=600 V,V_(R)=30 V,R_(d)=15 V·s^(-1),E_(1/2)=3.5 lx·s.

关键词： charge generation material naphthoylurea benzoxazole bisazo compounds photoconductivity

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Efficient CHzNHzPbl3 perovskite solar cells with 2TPA- n-DP hole-transporting layers

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Nano Research 2015年第4期8卷 1116-1127页

作者： lifeng Zhu Junyan Xiao Jiangjian Shi Junjie Wang Songtao Lv Yuzhuan Xu Yanhong Luo YinXiao Shirong Wang Qingbo Meng xianggao li Dongmei li Key Laboratory for Renewable Energy (CAS) Beijing Key Laboratory for New Energy Materials and Devices 8eijing National Laboratory for Condense Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

CH3NH3PbI3 perovskite solar cells with 2TPA-n-DP （TPA = 4,4＇-（（1E, I＇E,3E,3＇E）- [1,1＇-biphenyl]4,4＇-diylbis（buta-1,3-diene-4,1-diyl））; DP = bis（N,N-di-p-tolylaniline）; n = 1, 2, 3, 4） as hole-transporting materials （HTMs） have been fabricated. After optimization of the mesoporous TiO2 film thickness, devices based on 2TPA- 2-DP with power conversion efficiencies （PCEs） of up to 12.96% have been achieved, comparable to those of devices with （2,2＇,7,7＇-tetrakis（N,N-di-p- methoxyphenylamine）-9,9＇-spirobifluorene）（spiro-OMeTAD） as HTM under similar conditions. Further time-resolved photoluminescence （PL） measurements showed a fast charge transfer process at the perovskite/2TPA-2-DP interface. With the aid of electrochemical impedance spectra, a study of the electron blocking ability of 2TPA-2-DP in the device reveals that the presence of 2TPA-2-DP can greatly increase charge transfer resistance at the HTM/Au interface in the device, thus reducing the recombination. Furthermore, the perovskite solar cells based on these four HTMs exhibit ~ood stability after testin~ for one month.

关键词： perovskite solar cells organolead halide hole-transportingmaterials interfacial recombination

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Titanylphthalocyanine as hole transporting material for perovskite solar cells

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Journal of Energy Chemistry 2015年第6期24卷 756-761页

作者： Mengna Sun Shirong Wang Yin Xiao Zhihao Song xianggao li School of Chemical Engineering and Technology Tianjin University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

Titanylphthalocyanine （TiOPc） as hole transporting material （HTM） was successfully synthesized by a simple process with low cost. Perovskite solar cells using the TiOPc as HTM were fabricated and characterized. TiOPc as HTM plays an important role in increasing the power conversion efficiency （PCE） by minimizing recombi- nation losses at the perovskite/Au interface because TiOPc as HTM can extract photogenerated holes from the perovskite and then transport quickly these charges to the back metal electrode. In the research, the β-TiOPc gives a higher PCE than α-TiOPc for the devices due to sufficient transfer dynamics, The β-TiOPc was applied in perovskite solar cells without clopping to afford an impressive PCE of 5.05% under AM 1.5G illumination at the thickness of 40 nm which is competitive with spiro-OMeTAD at the same condition. The present work suggests a guideline for optimizing the photovoltaic properties ofperovskite solar cells using the TiOPc as the HTM.

关键词： Perovskite Solar cell Titanylphthalocyanine Hole transporting material Power conversion efficiency

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Application of phenonaphthazine derivatives as hole-transporting materials for perovskite solar cells

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Journal of Energy Chemistry 2016年第4期25卷 702-708页

作者： Xueyuan liu Fei Zhang Xicheng liu Mengna Sun Shirong Wang Dongmei li Qingbo Meng xianggao li School of Chemical Engineering and Technology Tianjin University Collaborative Innovation Center of Chemical Science and Engineering Beijing Key Laboratory for New Energy Materials and Devices Key Laboratory for Renewable Energy (CAS) Institute of Physics Chinese Academy of Sciences

Two electron-rich, solution-processable phenonaphthazine derivatives, 5,12-bis(N-[4,4'-bis-(phenyl) aminophen-4 ''-yl]}-phenonaphthazine (BPZTPA) and 5,12-bis{N-[4,4'-bis(methoxy-phenyl)aminophen-4'-phenonaphthazine (MeO-BPZTPA) have been designed and employed in the fabrication of perovskite solar cells. BPZTPA and MeO-BPZTPA exhibit excellent thermal stabilities, hole mobilities (similar to 10(-4) cm(2)/(V.s)) and suitable HOMO levels (-5.34 and-5.29 eV, respectively) relative to the valence band of the CH3NH3PbI3 and Au work function, showing their potential as alternative hole-transporting materials (HTMs). Meanwhile, the corresponding mesoporous TiO2/CH3NH3PbI3/HTM/Au devices are investigated, and the best power conversion efficiency of 10.36% has been achieved for MeO-BPZTPA without using p-type dopant. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Perovskite solar cell Phenonaphthazine Hole-transporting material Triphenylamine derivatives

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Effect of concomitant anti-solvent engineering on perovskite grain growth and its high efficiency solar cells

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Science China Materials 2021年第2期64卷 267-276页

作者： Tong liu Xiaofei Dong Juncong li Hongli liu Shirong Wang xianggao li School of Chemical Engineering and Technology Tianjin UniversityTianjin300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin300072China

The grain boundaries and interface properties in the active layers of perovskite solar cells(PSCs)are important factors affecting the performances of the *** this work,a simple and fast concomitant annealing process is established by inducing the secondary growth of the grains using the anti-solvent o-dichlorobenzene(o-PhCl2)or chlorobenzene(PhCl)to suppress the volatilization of solvent molecules during the FA0.80MA0.15Cs0.05Pb(I0.85Br0.15)3(FA,CH5N2+,formamidine;MA,CH3NH3+,methylamine)film annealing *** effects of anti-solvent molecules on the phase transformation,grain boundary fusion and morphology evolution of perovskite films are systematically investigated by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results indicate that anti-solvent molecules can inhibit solvent evaporation in the active layers and promote crystallite dissolution and ordered secondary growth along the surfaces of large *** can promote the formation of large grains and the passivation of surface defects,and can be favorable for the separation and transportation of photocarriers in the active ***,the power conversion efficiency(PCE)of PSCs can be effectively improved,with a PCE of 20.72%being achieved by a secondary growth perovskite film optimized with ***,the efficiency remains at 85%of its initial value after 2400 h of treatment in a natural indoor environment with a relative humidity of 45±5%.

关键词： anti-solvent vapor annealing perovskite grains secondary growth defect passivation solar cells

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Mixed Cations Enabled Combined Bulk and Interfacial Passivation For Efficient and Stable Perovskite Solar Cells

Mixed Cations Enabled Combined Bulk and Interfacial Passivat...

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第十届新型太阳能材料科学与技术学术研讨会

作者： Pengfei Wu Shirong Wang xianggao li Fei Zhang School of Chemical Engineering and Technology Tianjin University Collaborative Innovation Center of Chemical Science and Engineering (Tianjin)

Here,we report a mixed GAI and MAI(MGM) treatment method by forming a 2D alternating-cation-interlayer(ACI) phase(n=2) perovskite layer on the 3D perovskite,modulating the bulk and interfacial defects in the perovskite films simultaneously,leading to the suppressed nonradiative recombination,longer lifetime,higher mobility,and reduced trap ***,the devices’ performance is enhanced to 24.5% and 18.7% for 0.12 and 64 cm2,*** addition,the MGM treatment can be applied to a wide range of perovskite compositions,including MA-,FA-,MAFA-,and CsFAMA-based lead halide perovskites,making it a general method for preparing efficient perovskite solar *** encapsulation,the treated devices show improved stabilities.

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电泳显示用高质量铁锰黑纳米分散系的构建

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化工进展 2022年第6期41卷 3178-3185页

作者：李娟娟张天永李祥高天津大学化工学院天津300072

通过表面改性技术获得电泳显示用非水介质分散铁锰黑纳米粒子。在异构十二烷(Isopar L)中,选用十六烷基三甲基溴化铵(CTAB)、十二烷基硫酸钠(SDS)、(N-四乙烯四胺)聚异丁烯单丁二酰亚胺(T151)和山梨糖醇酐三油酸酯(Span 85)四种表面改性... 详细信息

通过表面改性技术获得电泳显示用非水介质分散铁锰黑纳米粒子。在异构十二烷(Isopar L)中,选用十六烷基三甲基溴化铵(CTAB)、十二烷基硫酸钠(SDS)、(N-四乙烯四胺)聚异丁烯单丁二酰亚胺(T151)和山梨糖醇酐三油酸酯(Span 85)四种表面改性剂,通过混合球磨工艺对铁锰黑粒子进行表面修饰,研究了修饰后铁锰黑粒子在Isopar L中的粒径分布和表面荷电性质。T151对铁锰黑的修饰效果最好,原始铁锰黑粒子的平均粒径为1μm,zeta电位为-18.58mV,改性后粒径分布为117.6nm±20.5nm,平均粒径为110nm,zeta电位为-96.71mV。将改性铁锰黑粒子用作电泳显示黑粒子,制备的器件在外加电场下具有电泳响应,对比度为5.6。改性铁锰黑粒子在兼顾高分散稳定性和高带电量的同时还具有耐高温和环保的特质,这不仅为铁锰黑粒子在电泳显示应用中提供了可靠的实验基础,也为电泳黑粒子的选择提供了更多的可能性。

关键词：铁锰黑纳米粒子粒度分布异构十二烷 zeta电位电泳显示

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